I do not think 34mm is too small, depending upon wrist size. That one seems to fit you well. For myself, I wear mostly 36-38mm watches. The exception on the large size is my Seiko SKX. Just wear whatever you like.
IMO the only place a butterfly clasp makes sense is on a formal dress watch that is only worn rarely. Any watch meant for daily or very regular wear needs a clasp with micro adjustment.
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